Extraction of dioxouranium(VI) in small channels using ionic liquids

Dimitrios Tsaoulidis, Valentina Dore, Panagiota Angeli*, Natalia V. Plechkova, Kenneth R. Seddon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


The extraction behaviour of dioxouranium(VI) from nitric acid solutions with tributylphosphate (TBP) dissolved (30%, v/v) in room temperature ionic liquids (viz. 1-butyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide, [C4mim][NTf2], 1-decyl-3-methylimidazolium bis{(trifluoromethyl)sulfonyl}amide, [C10mim][NTf2], and trihexyltetradecylphosphonium bis{(trifluoromethyl)sulfonyl}amide, [P66614][NTf2]) was investigated. The experiments were performed in a capillary (0.5mm internal diameter) made of Teflon, operated in the plug flow regime. The effects of ionic liquid type, initial nitric acid concentration, and residence time on dioxouranium(VI) extraction were studied. UV-vis spectroscopy was used for the determination of the dioxouranium(VI) concentration in the ionic liquid phase. For increasing [HNO3]aq,init, the %extraction decreased and then increased for [C4mim][NTf2], while for the other two ionic liquids it increased. The %extraction also increased with residence time in the channel. Overall mass transfer coefficients were about 0.2s-1 in all TBP/ionic liquid systems at the initial nitric acid concentration of 3M when a 10cm capillary was used.

Original languageEnglish
Pages (from-to)681-687
Number of pages7
JournalChemical Engineering Research and Design
Issue number4
Publication statusPublished - Apr 2013


  • Dioxouranium(VI)
  • Ionic liquids
  • Liquid-liquid extraction
  • Microchannels

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Chemistry


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